*{
    margin: 0;
    padding: 0;
  }
  html,body,#app{
    width: 100%;
    height: 100%;
  }
  .main{
     min-width: 375px;
     max-width: 750px;
     margin: 0 auto;
     /* height: 100%; */
  }
  ul,ol{
    list-style: none;
  }
  a{
    text-decoration: underline;
  }
  img{
    display: block;
  }